Yeah, Microchip moved everything around in the K22's.
TMR4IF is at PIR5.0
TMR4IE .. .. PIE5.0
TMR4IP .. .. IPR5.0

At this point, the only fix is to copy DT_INTS-18.bas to a new file, say DT_INTS-18K22.bas and edit the corresponding flags.

Timers 5 and 6 are also in PIR5/PIE5/IPR5.
CCP3, 4 and 5 are in PIR4/PIE4/IPR4.